Overview
The INA128PA, produced by Texas Instruments, is a low-power, general-purpose instrumentation amplifier that offers excellent accuracy. This amplifier features a versatile three op-amp design and a small size, making it an excellent choice for a wide range of applications. The INA128PA is part of the INA12x series, which includes the INA128 and INA129 models. These amplifiers are known for their current-feedback input circuitry, which provides wide bandwidth even at high gain settings.
The INA128PA is available in 8-pin plastic DIP and SO-8 surface-mount packages, specified for the –40°C to +85°C temperature range. It is also available in a dual configuration, the INA2128. The amplifier offers an industry-standard gain equation with a 50-kΩ resistor, allowing for flexible gain settings from 1 to 10,000.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Offset Voltage (RTI) | ±10 | ±50 | ±100 / G | µV |
| Offset Voltage Drift (RTI) | ±0.2 | ±0.5 | ±2 / G | µV/°C |
| Input Bias Current | ±2 | ±5 | ±10 | nA |
| Voltage Noise (RTI) | 8 | 10 | nV/√Hz | |
| Common-Mode Rejection Ratio (CMRR) | 80 | 120 | 130 | dB |
| Bandwidth (G = 1) | 1.3 | MHz | ||
| Supply Voltage | ±2.25 | ±15 | ±18 | V |
| Quiescent Current | 700 | µA | ||
| Operating Temperature Range | –40 | +85 | °C |
Key Features
- Low offset voltage: 50 µV, maximum
- Low drift: 0.5 µV/°C, maximum
- Low input bias current: 5 nA, maximum
- Low noise: 8 nV/√Hz, 0.2 µVpp
- High CMR: 120 dB, minimum
- Bandwidth: 1.3 MHz (G = 1)
- Inputs protected to ±40 V
- Wide supply range: ±2.25 V to ±18 V
- Low quiescent current: 700 µA
- Packages: 8-pin plastic DIP, SO-8
- Flexible gain settings from 1 to 10,000 using a single external resistor
Applications
- Pressure transmitter
- Temperature transmitter
- Weigh scale
- Electrocardiogram (ECG)
- Analog input module
- Data acquisition (DAQ)
Q & A
- What is the maximum offset voltage of the INA128PA?
The maximum offset voltage of the INA128PA is 50 µV.
- What is the drift specification of the INA128PA?
The drift specification of the INA128PA is 0.5 µV/°C, maximum.
- What is the input bias current of the INA128PA?
The input bias current of the INA128PA is 5 nA, maximum.
- What is the noise specification of the INA128PA?
The noise specification of the INA128PA is 8 nV/√Hz, 0.2 µVpp.
- What is the common-mode rejection ratio (CMRR) of the INA128PA?
The CMRR of the INA128PA is 120 dB, minimum.
- What is the bandwidth of the INA128PA at a gain of 1?
The bandwidth of the INA128PA at a gain of 1 is 1.3 MHz.
- What is the supply voltage range of the INA128PA?
The supply voltage range of the INA128PA is ±2.25 V to ±18 V.
- What is the quiescent current of the INA128PA?
The quiescent current of the INA128PA is 700 µA.
- What are the available packages for the INA128PA?
The INA128PA is available in 8-pin plastic DIP and SO-8 surface-mount packages.
- What are some common applications of the INA128PA?
The INA128PA is commonly used in pressure transmitters, temperature transmitters, weigh scales, electrocardiograms (ECG), analog input modules, and data acquisition (DAQ) systems.
